RE: BY O 040216

From: Ted Molczan via Seesat-l <>
Date: Sat, 2 Apr 2016 00:22:52 -0400
Brad Young wrote:

> Spoke way too soon about Hitomi - has really sped up
> and gotten more flashy no longer showing an A component - with 10 pieces, I wonder if it has
> gone through more breakup, causing spin up?
> FPAS12,41337,R8336A,20160402,015015,0.5s,-,36.1,-95.9,201,FUBF,REE,k,0.3s,2,inv,G1CkNNT,N,-
> ,-,-,124.3 0.5 049 02.589 F'FF,-,-,-;

USSTRATCOM's TLEs for Hitomi (16012A / 41337) from 16086.39579725 through 16091.92327283, were for the orbit of one of
the pieces of debris, which has since been reassigned to 16012L / 41442. Assuming that USSTRATCOM now has the correct
orbit for Hitomi, then the epoch 16092.19314741 TLE is the first correct one issued since the debris-shedding event.
Judging by the time of your FPAS observation tonight, that is the TLE that you used.

Assuming your observed flash period of 2.589 s is of primary flashes, and rotational symmetry of order 2, then Hitomi's
period of rotation is about 5.2 s, and the rate of rotation is about 11.5 RPM. Confirming observations would be worth

Ted Molczan

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Received on Fri Apr 01 2016 - 23:23:32 UTC

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